The inverter forms the logical link (value ru18) AND (value flag level 2).
For example, if input I2 is active, the result of the AND operation is:
2 (0010 binary) AND 7 (0111 binary) = 2 (0010 binary)
The flag is set if the result is unequal to 0.
If an output shall only be set if several conditions are fulfilled simultaneously, the single
flags must be assigned AND-operated to an output (programmable with do19 AND opera-
tion for output and the select flag parameters do20…do27)
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